Fixed a bug which caused this crash message:
IOError: [Errno socket error] [Errno 10060] A connection attempt failed
because the connected party did not properly respond after a period of
time, or established connection failed because connected host has
failed to respond
The bug was caused by us adding a DOCTYPE definition to Nmap's XML
output which caused Python's XML parser to try and fetch the DTD
every time it parses an XML file. We now override that DTD-fetching
behavior. [Daniel Miller]